INSTRUCTIONS:
Preheat oven to 350ºF. Bring a large pot of lightly salted water to a boil. Cook lasagna noodles in boiling water for 8-10 minutes. Drain and rinse with cold water.

Meanwhile, melt the butter in a large saucepan over medium heat. Cook the onion and garlic in the butter until tender, stirring frequently. Stir in flour and salt; simmer until bubbly.

Mix in the broth and milk, and boil, stirring constantly, for 1 minute. Stir in 2 cups of mozzarella cheese and 1/2 cup Parmesan. Season with basil, oregano and ground black pepper. Remove from heat and set aside.

Spread 1/3 of the sauce mixture on the bottom of the 9×13 inch baking dish. Layer with 1/3 of the noodles, and all of the ricotta and the chicken. Arrange 1/3 of the noodles over the chicken and layer with 1/4 of the sauce mixture, the spinach, and the remaining 2 cups of mozzarella cheese and 1/2 cup Parmesan cheese.